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N any of the settings for the f-number of a camera 相机的光圈数刻度
Remember, going up an f-stop cuts the amount of light by half.
记住，调高f值是减少光线量的一半。
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Camera lenses have two general attributes: f-stop and focal length.
照相机镜头有两项一般属性：f制光圈和焦距。
The f-stop values mentioned above are fairly standard among lenses;
上述的f值是一般标准镜头的常用值；
His favourite piece of tech is his F-Stop Satori EXP, a rucksack he uses when carrying his gear to remote locations.
BBC: Pro photographers reveal their top travel gear
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